Tide turns as Spain’s pro-union Socialists win regional elections
Six years after plunging Spain into its worst political crisis in decades, Catalonia's separatist parties are in danger of losing..
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Tide
Rise and fall of the sea level under astronomical gravitational influences
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and are also caused by the Earth and Moon orbiting one another.
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